[英]Multiplication of 2D array and 3D array
I have 3D A matrix 3x3x5 (The third dimension is 5) and 2D B matrix (3x3).我有 3D A 矩阵 3x3x5(第三维是 5)和 2D B 矩阵(3x3)。 I want to multiply A and B to obtain (3x3x5) matrix.
我想将 A 和 B 相乘以获得 (3x3x5) 矩阵。 Then sum the elements of the resulting 3D matrix to create 2D matrix (3x3).
然后将生成的 3D 矩阵的元素相加以创建二维矩阵 (3x3)。 How can I do this?
我怎样才能做到这一点?
Simply use the *
operator to multiply numpy arrays.只需使用
*
运算符将 numpy 与 arrays 相乘即可。
import numpy as np
a = np.arange(45).reshape(3, 3, 5)
b = np.arange(9).reshape(3, 3)
c = a * b
print(c) # 3x3x5 array
d = np.sum(c, axis=-1)
print(d)
d
should be the answer you are looking for. d
应该是您正在寻找的答案。
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